Filler-tube cap.



W, R. WEBSTER FILLER TUBE GAP.

APPLICATION FILED PEB` 6, 19H3 Patented Jan. 19, 1915.

.UNITED srnsns retient WILLIAM 3. WEBSTER, OF BRDGEFORT, CONNECTICUT, ASSIGNOR TO BRIDGEPGB' BRASS COMPANY, 0F BRIDGEPORT, CONNEGTICUT, A CRPOR-ATION QF CON- NE CTICUT.

FILLER-TUBE CAP.

mesme.

Specification of Letters Patent.

lntented Jen. ist, MM5.

fo all i/f/LO/mit may concern.

Be it known that I, WILLIAM R. WEB- s'rnn, a citizen of the United States, residing i-n Bridgeport, county of Fairfield, and State of Connecticut,heve invented certain new and useful improvements in Filler-Tube (laps, of which the following is a full, clear, and exact description.

This'invention relates to caps for filler tubes, and the improved cap herein set Jforth is particularly intended for use With filler tubes for automobile radiators, although 'it muy be used advantageously in other applications.

The invention has among its objects to providea light sheet metal cup which may bev cheaply manufactured. in making the cup l use minimum amount of stocli and yet the construction is such that e particularly effective grip on the cap may be had by the operator when the cap is screwed into or out of its seat in the filler tube.

To these and other ends, the invention consists in the novel features to be hereinafter described and claimed.

.y In the Vaccompanying drawing, Figure i is e side elevation of a. filler tube cap ernbodying my invention7 Fig. is e top plan view of the same, Fig. 3 a bottom plan vien' of the cap, and Figs. t to if) inclusive, show various stages in the process of menu facture.

The construction of the finished cup Will be most clearly understood from a description of the method by uf'hich it is made.

Referring particularly to Fig. 4, l take e disk Q0 of or other suitable sheet metal and place it in a die 2l. Thedisli 2G is then .pushed through the die 21 by a. punch or plunger 220i appropriate forni. as shown in Fig. 5, in order to forni the disk into a cup 23, as shown in Fig. G. The cup Z3 is then placed in e fein-.ile die 2e r(Fig. 7) the cavity of which is generally cup shaped but is provided at the bottom with radial cutaway portions A punch or male die Q6 conforming to the shape of the die :2e is brought down into the cup 23 to form it between the die und punch. and the blank is given the shape shown in Fig. 8. The closed end of the cup is dome shaped as before but it is provided with a number of radially directed bosses 27. The curves of these bosses must necessarily be quite gentle in order to avoid breakage of the comparatively thin metal.v

After the forming operation just described7 the blank Q8 shown in Fig. 8 is .lub-

"l0: troni which will be noted that the bo... are inade sharper :ind more freute. rllheir side Walls are squeezed closer together to form radial Wings and the :ingle between the sid-e all of wing and the dome shaped outer surface of the main portion of the cup inoie clearly defined. f Moreover, the upper edges oi the wings are brought higher above the top of the cap proper in spite of the tact il it the wings are formed on the downwardly sloping surface of the cup rather than on the sunnnit thereof. The blank is then stainpal to bring it into the torni shown in Fig. il. wherein the Wings ure sti l further accentuated. The side Wells of each wing are brought closer together and the upper tips ot the wings are nerroived and sharpened. The cylindrical side ivall 3Q of the blnnli is then drawn down to a certain extent, as shown in Fig. l2, in order to straighten and true the seine. Tim outer surface of this side wall is then prothe vided in a well known manner with exterior' screiv threads. and after washing, bufiing and iacquering the cap Will be complete.

:is shoivn in Figs. l, 2 and 3, the finished cap is provided'ivith a cylindrical side Wall 39) having exterior screvvv threads 3f; and the top of the cap .is dome shaped, es indicated :it 35. and provided with the upwardly directed wings 3G. These wings may be orked out or" the oep to n considerable tent. as shown in Fig. l, so :is toproject substantiallvv above the: top of the dome, and vet .in spite of the thinness ci the metal the operations are such as to prevent any puncturing of the wings. The side ivells of the wings nre sharply defined and proiect up.

are CorrespoiulinglyA formed.

the center of the cap so as to leave the summit of the dome of substantially the original thickness. In this manner the strength of the device is not appieciably impaired in view of the fact that solid portions of the thicker metal extend completely around each of the wings.

As constructed, the Wings have been found to afford a very satisfactory grip fdr le the fingers of the operator in screwing tlxf` cap into the filler tube or unscrewing therefrom. Moreover, the-construction l reduces the weight of the cap to a ini. nuun, and as the, Wings may be punched up from ,A a comparatively thin disklilr'e bla` the article may bevery vcheaply and idue stretching of the metal ing operations may be ling the blank in a Well manner. l prefer to anneal and c me hlanlr prior to forming operations shown in Fins. 7 and 9 respectively, and

' tainping operation which aca form of the Wings and gives ape shown in Fig. 11.. vThese other :tentures of niy invention are sus ble of niodication, however7 Within ofjse of the appended claims. Y

l claim is:v l cap such asdescr1bed, comprising a Sheet metal body formed like an inverted cup and having a dome shaped top With radial hollow gripping Wings on the side of the dome; substantially as described.

2. A filler tube cap` comprising' a cup shaped sheet inetal body having a dome shaped top, and .upwardly projecting hollow integral gripping wings on the side of tliedome portion extending above the sum- 40 mitrof'the cap; substantially as described.

A filler tube cap comprising a sheet I uetalbody having a cylindrical side Wall and a dome shaped top, and radial hollow wings struck up from the downwardly slanting portion of the donne remote from the center thereof; substantially as describe As article of manufacture, a filler tube cap comprising a cylindrical side Wall, 50 a dome shaped top, and hollow Wings struck up from the downwardly slanting portion o1 the dome remote from the 'center thereof and having substantiallyl upright outer Walls or edges adjacent theperiphery of the cap, and upper edges or Walls inclined d oWn- Wardly toward the summit ofthe dome; substantially as described. y

ln Witness whereof, I have hereunto set myv hand on the 31st day of January, 1913. 60

' l/VLLIAM R. WEBSTER.

Witnesses:

C. E. HU'roHiNsoN, O. H. PETERSON. 

